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Chemistry
Chemistry
Problem
Groundwater containing a high concentration of Ca
2
+
^{2+}
2
+
ions is treated with Na
2
_2
2
CO
3
_3
3
during a water-softening process. Explain why adding CO
3
2
−
_3^{2-}
3
2
−
ions causes CaCO
3
_3
3
(s) to precipitate and thereby lowers the concentration of dissolved Ca
2
+
^{2+}
2
+
ions.
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